Piston for air guns



June 11, 1 940.

. J. J. MGHENRY PISTON FOR AIR GUNS Filed Dec. 19, 1938 FlGJ.

FIGA.

INVENTOR JOHN JMCHENRY a. 51

A TTORNEYS Patented .1... 11, 1940 PISTON FORAIR GUNS John J. McHenry,Detroit, Mich'., assignor to Daisy Manufacturing Company,

Plymouth,

Mich, a corporation of Michigan I 7 Application December 19, 1938,Serial No. 246,716

4 Claims.

The invention relates to pistons for air guns of that type in which thepiston proper isprovided with a forwardly extending air tube passingthrough the abutment forming the forward end of the air chamber anddelivering compressed air from said chamber into the barrel. The airtube is'usually attached to the piston by having its rear end insertedinto a socket and secured therein by solder. It is, however, necessaryto provide 10 a passage for the air from the cylinder into the tubewhich is usually formed by a drilled port in one side of the tube inclose proximity to the piston. 'Thus, this port remains open during themovement of the piston until its stroke is nearly completed, therebypermitting the compressed air to pass through the tube into the barrel.However, this port so weakens the tube that the latter is frequentlybroken off.

It is the object of the invention to obtain a the tube, and at the sametime providing a free passage for the air in the cylinder into the tube.

To this end, the invention consists in the construction as hereinafterset forth. In the drawing:

through the core portion of the piston and the air tube attachedthereto. Figure 2 is a section on line 2-2 of Figure .1; Figure 3 is aview similar to Figure 1, showing a slightly modified construction;

Figure 4 is a perspective view of the detached parts of the constructionshown in Figure 3;

As has been stated, it is usual to attach the air 36 tube to the core ofthe piston by providing the latter with a socket in which the end of thetube is soldered. This closes the end of the tube and necessitates theuse of the objectionable lateral port. With my improved construction thecore 40 member is formed with achannel through the forward end thereof,which communicates with the rear end of the tube and also with the airchamber in front of the piston. As shown in Figure 1, A is a cylindricalcore member provided with a peripheral flange B at its forward end,preferably formed by upsetting. C is the air tube upset at its rear endto form a peripheral flange D, and E is a sheet metal stampingsurrounding the tube C and provided with a plurality of prongs Fclinched about the flange B. As thus far described, the tube C isattached to the core A, but without provision for the passage of airinto the tube. For this purpose I form in the forward end of the coremember A a channel G 55 which extends transversely thereof and centrallyconstruction dispensing with this lateral port in Figure 1 .is a centrallongitudinal section communicates with the end of the tube. The outerends of the channel .register with ports H in the stamping E, therebypermitting free flow of air from the chamber-in front of the piston intothe end of the air tube. 5 In the modified construction shown in Figures3 and 4, in place of the peripheral flange B on the core member, thelatter is provided with a head portion I with a' recess J thereinforming an annular axially extending flange K. It is also 10 providedwith a transverse passage G which extends centrally across the bottom ofthe recess and through the annuar flange K. L is a disk surrounding thetube C and engaging the flange D thereof, said disk being of a diameterto fit 15 Within the recess J and being cut away at M to .registerwiththe passage .G. The flange K is then turned inward to embrace the disk,thereby securing the tube to the core member. There is also a struck-uplug N on the disk L for enter- 20 ing the transverse passage G' andholding the cut away portions M in registration with said passage.

With both of the constructions above described, the walls of the tubeare left imperforate from 25 end to end, so that there is nothingtoweaken the mechanical strength of said tube. At the same time, freeentrance ofair into the end of the tube is permitted during the entirecompression stroke of the piston.

What I claim as my invention is:

1. In a piston for air guns, a solid cylindrical core member enlargedand transversely slotted at its forward end, an axially aligned air tube'with a peripherally flanged rear end abutting against the slotted endof said core member and communicating with said slot, and clamp meanscoupling said air'tube to said enlarged end of said core member leavingan unobstructed air passage into said slot. 40

2. In a piston for air guns, a solid cylindrical core memberperipherally flanged at its forward end and also provided at saidforward end with a transversely extending slot, an axially aligned airtube flanged at its rear end abutting against the slotted end of saidcore member and communicating with said slot, and a member surroundingsaid air tube having a clinching engagement with the flange of said coremember also having a port therethrough'in communication with said slotfor passage of air.

3. In a piston for air guns, a solid cylindrical core member having arecess at its forward end with a surrounding annular flange and a slotextending transversely across the bottom of said recess, an axiallyaligned air tube flanged at its rear end and straddling said slot toabut against the bottom of the recess, and a disk sleeved upon said airtube and fitting within said recess being ported in registration withsaid slot, said annular flange being closed aboutsaid disk to secure thesame.

4. In a piston for air guns, a solid cylindrical core member having arecess at its forward end 1 with a surrounding annular flange and a slotex-

